Informix & Legacy Systems Developer

Global Business Ser. 4u; United States; Hybrid; USD 100,000 - 120,000; Full time

Job summary

A modern technology services company is seeking an Intermediate/Senior Informix & Legacy Systems Developer for a 6-month contract. This role is crucial for supporting and modernizing legacy IBM/Informix platforms, focusing on ERP and supply chain systems. The successful candidate will leverage expertise in Informix 4GL, Genero BDL, and SQL while managing mission-critical technical operations. The position offers flexibility in working from Batavia, IL or remotely, aiming to integrate legacy solutions with modern systems efficiently.

Qualifications

• Expert-level proficiency in Informix 4GL and Genero BDL.
• Advanced knowledge of IBM Informix Dynamic Server.
• Mastery of Unix-based operating systems.

Responsibilities

• Collaborate to design and implement robust solutions for legacy systems.
• Write and optimize clean, maintainable code in Informix.
• Resolve complex application issues using performance tools.

Skills

Expert-level Informix 4GL

Genero BDL

SQL

Java

Python

Perl

IBM Informix Dynamic Server

HP-UX

IBM AIX

Linux

Windows

EDI

XML

RESTful API

SOAP API

Git

GitHub

GitLab

Job description

Intermediate/Senior Informix & Legacy Systems Developer 6 months Contract + Batavia, IL or Remote

Position Overview

We are seeking a technical specialist with deep expertise in legacy IBM/Informix platforms. This role is critical to supporting and modernizing our legacy infrastructure, specifically focusing on HP-UX and IBM AIX environments. You will be responsible for maintaining mission-critical ERP, supply chain, and warehouse management systems while driving technical performance optimizations.

Key Responsibilities

• System Modernization & Design: Collaborate with cross-functional teams to design and implement robust solutions that bridge legacy logic with modern requirements (e.g., migrating Informix 4GL to Genero BDL).
• Legacy Maintenance: Write and optimize clean, maintainable code in Informix 4GL, Genero BDL, and Unix Shell Scripting (Korn, Awk).
• Technical Troubleshooting: Resolve complex application issues and database performance bottlenecks using utilities like oncheck and set explain.
• Deployment & Testing: Lead integration, UAT, and performance testing activities to ensure high-quality deployments with minimal business disruption.
• Support & Documentation: Manage incidents and work orders escalated from the Service Desk, adhering to established SLAs, and maintain comprehensive technical documentation.

Required Technical Skills

• Primary Languages: Expert-level Informix 4GL, Genero BDL, and SQL.
• Secondary Languages: Proficiency in Java, Python, or Perl for integration and modern application support.
• Database Management: Advanced knowledge of IBM Informix Dynamic Server (IDS); familiarity with SQL Server, Oracle, or Snowflake is a plus.
• Operating Systems: Mastery of Unix-based systems (HP-UX, IBM AIX, Linux) and Windows environments.
• Integrations: Understanding of EDI (810, 820), XML, and API integration (RESTful/SOAP).
• Version Control: Hands-on experience with Git, GitHub, or GitLab.

Preferred Domain Knowledge

• Experience with ERP Supply Chain concepts: Order creation, Pick-Pack-Ship, Invoicing, and Bill of Materials (BOM).
• Familiarity with Warehouse Management Systems (WMS) and manufacturing workflows.

Role & Project Scope

• Core Objective: Support and modernize a mission-critical Legacy ERP platform while expediting its integration with Salesforce and e-commerce platforms.
• Key Responsibilities:
  • Directly manage Informix 4GL development and maintenance.
  • Lead API build-out and integration projects alongside key technical stakeholders.
  • Operate within a Unix/Linux environment.
• Team Dynamics: Small, lean team consisting of one onsite resource and three offshore members; requires daily coordination with the offshore team